feat(db): Postgres schema for shared sellers, market_comps, reported_sellers

app/db/pg_migrations/001_shared_tables.sql

@@ -0,0 +1,43 @@
+-- Snipe shared tables: sellers, market_comps, reported_sellers
+-- Replaces the equivalent tables in shared.db (SQLite).
+-- Per-user tables (listings, trust_scores, saved_searches) remain in SQLite.
+
+CREATE TABLE IF NOT EXISTS sellers (
+    id                    BIGSERIAL PRIMARY KEY,
+    platform              TEXT NOT NULL,
+    platform_seller_id    TEXT NOT NULL,
+    username              TEXT NOT NULL,
+    account_age_days      INTEGER,
+    feedback_count        INTEGER NOT NULL DEFAULT 0,
+    feedback_ratio        DOUBLE PRECISION NOT NULL DEFAULT 0,
+    category_history_json TEXT NOT NULL DEFAULT '{}',
+    fetched_at            TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE (platform, platform_seller_id)
+);
+
+CREATE TABLE IF NOT EXISTS market_comps (
+    id           BIGSERIAL PRIMARY KEY,
+    platform     TEXT NOT NULL,
+    query_hash   TEXT NOT NULL,
+    median_price DOUBLE PRECISION NOT NULL,
+    sample_count INTEGER NOT NULL,
+    fetched_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    expires_at   TIMESTAMPTZ NOT NULL,
+    UNIQUE (platform, query_hash)
+);
+
+CREATE TABLE IF NOT EXISTS reported_sellers (
+    id                  BIGSERIAL PRIMARY KEY,
+    platform            TEXT NOT NULL,
+    platform_seller_id  TEXT NOT NULL,
+    username            TEXT,
+    reported_by         TEXT NOT NULL DEFAULT 'user',
+    reported_at         TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE (platform, platform_seller_id)
+);
+
+-- Migration tracking (same pattern as CommunityDB in circuitforge-core)
+CREATE TABLE IF NOT EXISTS _snipe_shared_migrations (
+    filename   TEXT PRIMARY KEY,
+    applied_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);